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f in (-oo:+oo)
50.7 = (5/9)*(f-32) // - (5/9)*(f-32)
50.7-((5/9)*(f-32)) = 0
(-5/9)*(f-32)+50.7 = 0
50.7-5/9*(f-32) = 0
50.7-5/9*(f-32) = 0
68.47777778-5/9*f = 0
68.47777778-5/9*f = 0
68.47777778-5/9*f = 0 // - 68.47777778
-5/9*f = -68.47777778 // : -5/9
f = -68.47777778/(-5/9)
f = 123.25999902
f = 123.25999902
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